Hi guys,
I found a problem when using OPB-HWICAP.
I builded a basic system containing a Softprocessor and the system's frequency was 50Mhz. HWICAP can works at 66Mhz.
In the bitgen.ut file, I set "-g M0Pin:PULLUP -g M1Pin:PULLUP -g M2Pin:PULLUP".
Then I run "xhwicap_low_level_example.c" from the HWICAP's driver in IDE. It contains an example of how to use the low-
level macros and functions of the XHwIcap driver.
When I run this file:
XHwIcap_mSetBram(BaseAddress, Index, ReadId[Index]) excuted. Write bitstream to bram OK.
XHwIcap_mSetSizeReg(BaseAddress, (XHI_EX_BITSTREAM_LENGTH<<2) -1) excuted. Write to the SIZE register OK.
XHwIcap_mSetOffsetReg(BaseAddress, 0) excuted. Write to the OFFSET register OK.
XHwIcap_mSetRncReg(BaseAddress, 0) excuted. Write a 0 to the RNC,begin transfer from the bram to the ICAP,OK.
Waited until (XHwIcap_mGetDoneReg(BaseAddress) != 0), means DONE and transfer completed.
XHwIcap_mSetSizeReg(BaseAddress, (XHI_EX_ONE_WORD<<2)-1) excuted, Write to the SIZE register OK.
XHwIcap_mSetOffsetReg(BaseAddress, XHI_EX_BITSTREAM_LENGTH) excuted, Write to the OFFSET register OK.
XHwIcap_mSetRncReg(BaseAddress, 1) excuted, initialize readback from the ICAP to the bram,OK.
Wait until (XHwIcap_mGetDoneReg(BaseAddress) != 0)...
Then comes the problem, the status register's DONE does not become "1" !!!
while (XHwIcap_mGetDoneReg(BaseAddress) == 0)
{
Retries++;
if (Retries > XHI_EX_MAX_RETRIES) //I even changed the XHI_EX_MAX_RETRIES from 100 to 10000.
{ //But it still time out!!!
/*
* Waited to long. Exit with error.
*/
print("waited too long!!!!\n");
return XST_FAILURE;
}
}
The opb_xhwicap's version is 10_0_a. The chip is Virtex II Pro 30 V2P30 in XUP V2P30.
Question1:What's the prolem? Why HWICAP is busy so long?
Question2:Is 50Mhz too fast?
Question2:When use XHwIcap_mSetRncReg(BaseAddress, 0) writing a 0 to the RNC,begin transfer from the bram to the ICAP.
But the ICAP put the bram data to where in device? I did not even assign a place in the Chip!
Anyone has advice? Thank you ahead.
